diff --git a/src/cgi.cpp b/src/cgi.cpp
index 5928dcc..a31c86a 100644
--- a/src/cgi.cpp
+++ b/src/cgi.cpp
@@ -20,7 +20,6 @@
 
 #include <cgicc/Cgicc.h>
 
-#include <exception>
 #include <fstream>
 #include <ios>
 #include <iostream>
@@ -32,8 +31,6 @@
 namespace FediBlock::cgi
 {
 
-using std::cerr;
-using std::exception;
 using std::getline;
 using std::ios;
 using std::ofstream;
diff --git a/src/files.cpp b/src/files.cpp
index 3dd2872..5e734a8 100644
--- a/src/files.cpp
+++ b/src/files.cpp
@@ -65,7 +65,7 @@ fs::path get_datadir()
     char *env{getenv("XDG_DATA_HOME")};
     if (env != nullptr)
     {
-        const auto path{fs::path(env) / "fediblock-backend"};
+        auto path{fs::path(env) / "fediblock-backend"};
         fs::create_directories(path);
         return path;
     }
diff --git a/src/git.cpp b/src/git.cpp
index 53614bf..7a00711 100644
--- a/src/git.cpp
+++ b/src/git.cpp
@@ -84,7 +84,7 @@ void create_branch()
     const string branch_name{get_branch_name()};
     const string ref_name{"refs/heads/" + branch_name};
     git_oid oid_parent;
-    git_commit *commit;
+    git_commit *commit{nullptr};
 
     // Get SHA1 of HEAD.
     check(git_reference_name_to_id(&oid_parent, _repo, "HEAD"));
@@ -92,7 +92,7 @@ void create_branch()
     // Translate SHA-1 to git_commit.
     check(git_commit_lookup(&commit, _repo, &oid_parent));
 
-    git_reference *branch;
+    git_reference *branch{nullptr};
     // Create new branch.
     check(git_branch_create(&branch, _repo, branch_name.c_str(), commit, 0));
 
@@ -127,11 +127,11 @@ void commit(const entry_type &entry)
     check(git_index_write(index));
 
     // Create commit.
-    git_signature *sig;
+    git_signature *sig{nullptr};
     git_oid oid_commit;
     git_oid oid_tree;
     git_oid oid_parent;
-    git_tree *tree;
+    git_tree *tree{nullptr};
     git_object *parent{nullptr};
     git_reference *ref{nullptr};
 
diff --git a/src/gitea.cpp b/src/gitea.cpp
index 6cccc81..9b459e4 100644
--- a/src/gitea.cpp
+++ b/src/gitea.cpp
@@ -91,7 +91,7 @@ size_t writer_body(char *data, size_t size, size_t nmemb)
 string api_request(const http_method method, const string_view path,
                    const string_view body)
 {
-    CURLcode code;
+    CURLcode code{};
     string url{string(_forge_baseurl) += path};
     _curl_buffer_body.clear();
 
@@ -132,7 +132,7 @@ string api_request(const http_method method, const string_view path,
         throw runtime_error{"libcurl error: " + to_string(code)};
     }
 
-    long http_status; // NOLINT(google-runtime-int)
+    long http_status{0}; // NOLINT(google-runtime-int)
     // NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
     curl_easy_getinfo(_connection, CURLINFO_RESPONSE_CODE, &http_status);
     if (http_status < 200 || http_status >= 300)
diff --git a/src/main.cpp b/src/main.cpp
index f8bfe0c..d10cce4 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -26,12 +26,10 @@
 
 #include <exception>
 #include <iostream>
-#include <string>
 
 using std::cerr;
 using std::cout;
 using std::exception;
-using std::to_string;
 
 using namespace FediBlock;